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Old 10-13-2006, 12:00 PM   #1
Neal Winkler
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Default Lactate as Fuel

Rob or Greg, I was wondering how the recent findings of Brook et al. on the existence of the lactate shuttle changes our understanding of the energy sytems. For example, I always associated the 3 muscle fiber types to the 3 energy systems. But now we know lactate is an energy source as well, what muscle fibers is it used by? 2a? 1? Both? Is it still fair to say that the the anaerobic metabolism lasts about 3 minutes? After all, I assume that CrossFit workouts are still producing lactate well after 3 minutes despite the fact that lactate is a byproduct of the glycogen pathway. Does this new info shed light on why this is so, if it is? Thanks, Neal
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